JP2011006960A - Earth retaining structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide earth retaining structure constructed inexpensively while preventing an underground space from getting narrow to the utmost.SOLUTION: The earth retaining structure 10 includes a vertical pile 11 provided along a bottom 2 of soil 1, an earth retaining plate 12 provided over the adjacent vertical pile 11, and a reinforcement insertion material 13 with an end projected outward from a wall 2 so constructed as to be buried into the soil 1, and is constituted to receive soil pressure acting on the earth retaining plate 12 via the vertical pile 11 by the reinforcement insertion material 13, and a recess 14 is formed at the vertical pile 11 in the earth retaining structure to fix an end of the reinforcement insertion material 13 to the vertical pile 11 in the recess 14. An attaching hole 11a is formed at the vertical pile 11, and a bottomed recess forming member 15 comprising the other member is engaged with and fixed to the attaching hole 11a to form the recess 14.

Description

  The present invention relates to a wall retaining structure formed by excavating the ground.

  As a soil retaining structure when constructing underground structures, vertical holes are formed in the ground at set intervals, vertical piles are constructed in the vertical holes, and the lower part is fixed to the ground with mortar. The ground is excavated to a certain depth along the pile to form an excavation hole, and a horizontal erection is provided in an erected shape inside the adjacent vertical pile, and the collapse of the wall of the excavation hole is prevented. The earth retaining plate is fixed over the adjacent vertical piles, and further, a horizontal hole that is inclined obliquely downward with respect to the horizontal direction and extends laterally is formed in the wall portion of the excavation hole, and an anchor material and a rock bolt material are formed in the horizontal hole. Insert the reinforcing bar insertion material and fix it on the ground with the cloud, fix the fixing base over the upper and lower ridges at the embedded position of the reinforcing bar insertion material, and insert and fix the end of the reinforcing bar insertion material to the fixing base , Earth pressure acting on the retaining plate, vertical pile and upset and fixing stand It is received by the reinforcing bar insertion material, and then the excavation hole is further excavated by a certain depth along the vertical pile, and the earth retaining plate, the reinforcing bar insertion material, and the fixing base are constructed as described above. A retaining structure constructed by sequentially performing operations is widely used.

  By the way, since the fixing pedestal is arranged to protrude inward from the uprising, the available underground space is narrowed by the amount of protrusion of the fixing pedestal, and the fixing pedestal is said to interfere with various construction work on the underground space. There's a problem.

  Therefore, the fixing pedestal is provided so as to span the upper and lower flank so as not to protrude outward from the flank, and the end of the reinforcing bar insertion material is provided on the fixing pedestal so as not to protrude outward from the flank. A fixed earth retaining structure has also been proposed (see, for example, Patent Document 1).

JP 11-247191 A

  However, even when configured as described in Patent Document 1, since a fixing base for fixing the reinforcing bar insertion material is separately required, the material cost of the earth retaining structure is increased, and only the thickness of the flank is increased. There is a problem that the underground space becomes narrow.

  An object of the present invention is to provide a soil retaining structure that can be constructed at low cost while preventing the underground space from becoming narrow as much as possible.

  The earth retaining structure according to the present invention was embedded in the ground with vertical piles provided along the wall portion of the ground, earth retaining plates provided over the adjacent vertical piles, and protruding end portions outward from the wall portions. In the earth retaining structure configured to receive the earth pressure acting on the retaining plate with the reinforcing bar insertion material through the vertical pile, the concave portion is formed in the vertical pile, The end is fixed to the vertical pile in the recess. In the present specification, the reinforcing bar insertion material means a fixing member to the ground such as an anchor material or a rock bolt material.

  In this earth retaining structure, earth pressure acting on the earth retaining plate is received by the reinforcing bar insertion material through the vertical pile. In addition, by fixing the end of the reinforcing bar insert to the vertical pile in the recess formed in the vertical pile, it is possible to omit the anchoring base and the erection, so that the construction cost of the earth retaining structure can be reduced, and the inside from the ground By reducing the protruding length of the earth retaining structure, it is possible to prevent the underground space from becoming narrow as much as possible, and it is also possible to prevent the fixing pedestal and the erection from becoming obstacles to work.

  Here, an erection is provided in an erected shape in the middle of the vertical pile in the height direction, a recess is formed in the erection instead of the vertical pile, and the end of the reinforcing bar insertion material is placed in the recess. It is a preferred embodiment to fix to the abdomen. In this case, by fixing the end of the reinforcing bar insertion material to the flank in the recess formed in the flank, it is possible to omit the fixing pedestal placed on the upper and lower flank, so the construction of the earth retaining structure The cost can be reduced, and the protruding length of the earth retaining structure from the ground to the inside can be reduced to prevent the underground space from being narrowed as much as possible.

  A vertical erection is provided in the middle of the vertical pile in the height direction, a recess is also formed in the erection, and the end of the reinforcing bar insertion material is a vertical pile or erection in the recess. It is also a preferred embodiment to fix to. In this case, by fixing the ends of the reinforcing bar inserts to the vertical pile or the flank in the vertical pile and the recess formed in the flank, the fixing base arranged on the upper and lower flank can be omitted. Therefore, the construction cost of the earth retaining structure can be reduced, and the length of the earth retaining structure protruding from the ground to the inside can be reduced to prevent the underground space and the like from being narrowed as much as possible.

  A mounting hole is formed in the vertical pile and / or the flank that forms the concave portion corresponding to the concave portion, and a bottomed concave portion forming member made of another member is fitted and fixed to the mounting hole to form the concave portion. This is also a preferred embodiment. In this case, it is possible to simplify the processing for the vertical pile and the erection, and it is possible to reduce the manufacturing cost of the vertical pile and the erection that have the recess. However, it is also possible to directly form a recess for fixing the end portion of the reinforcing bar insertion material on the vertical pile and / or the upset.

  A spherical seat that receives the end of the reinforcing bar insertion member so that the angle can be adjusted may be formed in the recess. Since the construction direction of the reinforcing bar insertion material with respect to the ground varies, it is preferable that the reinforcing bar insertion material is received by a spherical seat so that the angle can be adjusted.

  It is a preferred embodiment that the vertical piles and / or erections forming the recesses are made of steel pipe. Although it is possible to configure the vertical pile and / or the flank forming the concave portion with an H-shaped steel or the like, if an attempt is made to form the concave portion in the central portion of the vertical pile and / or the flank, It is necessary to provide a reinforcing bar insertion material so as to cross the web portion, and the strength of the vertical pile and / or the erection is greatly reduced. Therefore, by configuring the vertical pile and / or the erection with a steel pipe such as a round shape or a square shape as in the present invention, the strength of the vertical pile and / or the erection is increased using the internal space of the steel pipe. The concave portion can be formed without causing a decrease, and the earth pressure acting on the vertical pile and / or the erection can be received by the reinforcing bar insertion material in a well-balanced manner. In particular, it is preferable to use a square steel pipe because the recess can be easily formed.

  According to the earth retaining structure according to the present invention, by fixing the end of the reinforcing bar insertion material to the vertical pile in the recess formed in the vertical pile, it is possible to omit the fixing base and the erection, so the construction cost of the earth retaining structure can be reduced. In addition to reducing the protrusion length of the earth retaining structure from the ground to the inside, it is possible to prevent the underground space from being narrowed as much as possible, and it is also possible to prevent the fixing pedestal and the erection from becoming obstacles to work.

The perspective view of the earth retaining structure of 1st Example Longitudinal section of the soil retaining structure Exploded perspective view of the same vertical pile Longitudinal section of the main part of the concave structure Fig. 4 equivalent diagram of another earth retaining structure Exploded perspective view of vertical pile used in other earth retaining structure The perspective view of the earth retaining structure of 2nd Example Longitudinal section of the main part of the concave structure

Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)
As shown in FIGS. 1 to 4, the earth retaining structure 10 prevents collapse of a wall portion formed by excavating an inclined ground or a wall portion 2 formed by excavating the ground 1 to form an underground space, for example. For this purpose, the vertical piles 11 provided along the wall 2, the earth retaining plate 12 provided over the adjacent vertical piles 11, and the reinforcing bar inserts embedded in the ground 1 with the ends protruding from the wall 2. 13, the recess 14 is formed in the vertical pile 11, the end of the reinforcing bar insert 13 is fixed to the vertical pile 11 in the recess 14, and the earth pressure acting on the earth retaining plate 12 is It is comprised so that it may receive with the reinforcing bar insertion material 13 via.

  The reinforcing bar insert 13 is composed of a known ground anchor composed of an anchor head, a tension part, and an anchor body. The reinforcing bar insert 13 is fixed to the vertical pile 11 at the end of the reinforcing bar insert 13. The screw shaft 13a is integrally formed. When constructing the reinforcing bar insertion material 13, first, a hole 3 is formed in the wall 2 of the ground 1, which is inclined slightly downward in the horizontal direction, and then the hole 3 is filled with a grout 4. After the construction, the rebar insertion material 13 is inserted into the drilling hole 3 so that the screw shaft 13a protrudes from the wall portion 2, and the grout 4 is cured and solidified to be embedded in the ground 1. However, with the reinforcing bar insertion material 13 inserted into the drilling hole 3 formed in the ground 2, the grout 4 is filled between the drilling hole 3 and the reinforcing bar insertion material 13, and the reinforcing bar insertion material 13 is embedded in the grout 4. You can also.

  The vertical pile 11 is comprised with a square steel pipe, and the dimension of each part can be set suitably according to the height etc. of a wall part. Corresponding to the construction position of the reinforcing bar insert 13, mounting holes 11 a made up of square holes are formed at set intervals in the middle of the height direction of the front surface of the vertical pile 11, and mounting holes are formed on the rear surface side of the vertical pile 11. A rear insertion hole 11b through which the reinforcing bar insertion material 13 is inserted is formed corresponding to 11a, and a recess forming member 15 having a recess 14 inside is fitted and fixed to the attachment hole 11a. In the first embodiment, the mounting hole 11a made of a square hole is formed in the vertical pile 11. However, for example, a circular or oval mounting hole other than the square hole is formed, and a recess forming member is used so as to fit it. It is also possible to configure. Moreover, although the recessed part 14 was formed using the recessed part formation member 15 which consists of a member different from the vertical pile 11, it is also possible to integrally form the recessed part 14 directly in the vertical pile 11 itself. In addition, it can replace with a square steel pipe as the vertical pile 11, and can use what consists of shape steels, such as H-shaped steel, I-shaped steel, and a grooved steel.

  The recessed portion forming member 15 is formed of a bottomed box-shaped member having an open front surface, and a flange portion 15a is formed at the front end portion of the recessed portion forming member 15 so as to overlap the rim of the mounting hole 11a from the front side. . The recess forming member 15 is preferably fixed to the vertical pile 11 via a fixing tool such as a bolt or a screw (not shown) in the flange portion 15a, but the fixing tool may be omitted. The bottom plate portion 15b of the recess forming member 15 is provided in an inclined shape so as to be substantially orthogonal to the reinforcing bar insertion member 13, and a front insertion hole 15c through which the reinforcing bar insertion member 13 is inserted is formed at a substantially central portion of the bottom plate portion 15b. Yes. However, the bottom plate portion 15b of the recess forming member 15 is formed substantially parallel to the flange portion 15a, and a wedge-shaped spacer is superimposed on the inside of the bottom plate portion to form an inclined surface orthogonal to the reinforcing bar insertion member 13 on the spacer. Also good.

  The front end portion of the reinforcing bar insertion member 13 is disposed in the recess 14 of the recess forming member 15 through the rear insertion hole 11b and the front insertion hole 15c, and the reinforcing bar insertion member 13 has a presser plate 16 at the front end thereof. The presser plate 16 and the recess forming member 15 are fastened by fastening the nut member 17 to the screw shaft 13a of the reinforcing bar insertion member 13 with the presser plate 16 being overlapped with the bottom plate portion 15b of the recess forming member 15. It is being fixed to the vertical pile 11 via.

  The depth to the bottom plate portion 15 b of the recess forming member 15 is set to such a depth that the nut member 17 does not protrude outside the vertical pile 11 in a state where the nut member 17 is screwed to the end of the reinforcing bar insertion member 13. ing. Moreover, the protrusion length from the wall part 2 of the reinforcing bar insertion material 13 is the length which the front end part of the reinforcing bar insertion material 13 does not protrude outside the recessed part 14 in the state which fixed the reinforcing bar insertion material 13 to the vertical pile 11. Is set.

  For example, when constructing an underground space using the earth retaining structure 10, first, the vertical hole 5 is drilled at a set interval with respect to the ground 1, and the vertical pile 11 is inserted into the vertical hole 5. Then, mortar is poured into the lower part of the vertical hole 5 and the lower part of the vertical pile 11 is fixed to the ground 1 with mortar. Next, the ground 1 is excavated stepwise along the vertical pile 11 to a desired depth to form an excavation hole whose plane dimension is slightly wider than the underground space. When excavating the excavation hole, After the excavation is completed at each stage, the following work is performed to prevent the wall portion 2 from collapsing. That is, after the earth retaining plate 12 is constructed between the vertical pile 11 and the wall portion 2, it extends laterally from the wall portion 2 toward the obliquely lower side with respect to the horizontal direction through the rear insertion hole 11 b of the vertical pile 11. A hole 3 is formed in the ground 2. Next, the grout 4 is filled with the grout 4 and then the reinforcing bar insertion material 13 is loaded, and the grout 4 is cured and solidified. Next, after attaching the recess forming member 15 to the mounting hole 11 a so that the end of the reinforcing bar insertion member 13 is inserted into the front insertion hole 15 c of the recess forming member 15, the presser plate 16 is attached to the reinforcing bar insertion member 13. Attach it to the front end, fasten the nut member 17 to the screw shaft 13 a, and connect the vertical pile 11 to the reinforcing bar insertion material 13. In this way, after the rebar insertion material 13 is sequentially constructed at the position corresponding to the rear insertion hole 11b, the rebar insertion material 13 is sequentially fixed to the vertical pile 11, and the excavation hole is excavated to the next stage. The earth retaining structure 10 is constructed by sequentially performing the drilling of the holes, the construction of the reinforcing bar insertion material 13, and the fixing work of the reinforcing bar insertion material 13 to the vertical pile 11.

  In this earth retaining structure 10, since the fixing base and the erection are not required, the material cost of the earth retaining structure 10 can be reduced, and the underground space is narrowed by these members, or these members become obstacles to work. Can be surely prevented.

  Next, another embodiment in which the structure of the earth retaining structure 10 is partially changed will be described. The same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

(1) As shown in FIG. 5, a spherical seat 20 is formed in the bottom plate portion 15b of the recess forming member 15 so as to surround the front insertion hole 15c. It is possible to provide a presser member 21 having a partial spherical surface that fits the spherical seat 20 between 20 and through which the reinforcing bar insert 13 is inserted. In this case, even if the inclination angle of the reinforcing bar insertion member 13 slightly varies, the angle of the holding member 21 along with the reinforcing bar insertion member 13 along the spherical seat 20 can be adjusted. A sufficient contact surface can be secured and the earth pressure acting on the vertical pile 11 can be transmitted to the reinforcing bar insertion member 13 without difficulty.

(2) Like the vertical pile 11B shown in FIG. 6, it is the connection member 22 which connects the vertical pile division body 11Ba which consists of H-shaped steel, and the upper and lower vertical pile division body 11Ba, Comprising: End of the vertical pile division body 11Ba It is also possible to configure the vertical pile 11 by providing a connecting member 22 made of a square steel pipe with a size to fit the part, fitting the vertical pile divided body 11Ba into the connecting member 22 and connecting them with bolts or the like. is there. In this case, the recess forming member 15 is attached to the connecting member 22 by forming the attachment hole 11a and the rear insertion hole 11b as in the first embodiment.

(Second embodiment)
As shown in FIGS. 7 and 8, the earth retaining structure 30 includes a vertical pile 31 provided along the wall portion 2, a earth retaining plate 32 provided over the adjacent vertical piles 31, and a height on the front side of the vertical pile 31. A belly 33 provided in an erected shape over the vertical pile 31 adjacent to the middle part in the vertical direction, and a reinforcing bar insert 34 embedded in the ground 1 with its end protruding from the wall 2, A recess 35 is formed in the slab 33, and the end of the reinforcing bar insertion member 34 is erected in the recess 35 and fixed to the 33, and the earth pressure acting on the retaining plate 32 is erected with the vertical pile 31 through the erection 33. It is configured to be received by the reinforcing bar insertion material 34.

  The retaining plate 32 and the reinforcing bar insertion member 34 are configured in the same manner as the retaining plate 12 and the reinforcing bar insertion member 13 of the first embodiment. The vertical pile 31 can also be comprised by square steel pipes similarly to the said 1st Example, and can also be comprised by shape steels, such as H-section steel, I-shape steel, and a groove shape steel.

  The flank 33 is formed of a square steel pipe, and is supported substantially horizontally by a bracket 36 fixed to a middle portion in the height direction of the vertical pile 31. Mounting holes 33a made of square holes are formed at set intervals in the uplift 33 between the vertical piles 31 so as to correspond to the construction positions of the reinforcing bar insertion members 34, and rear insertion holes 33b through which the reinforcing bar insertion members 34 are inserted. A recess forming member 37 having a recess 35 on the inside is fitted and fixed to the mounting hole 33a. In the second embodiment, the concave portion 35 is formed by using the concave portion forming member 37 which is a member different from the flank 33, but the concave portion 35 may be directly formed integrally with the flank 33 itself. Is possible. Moreover, although the attachment hole 33a which consists of a square hole was formed, it is also possible to form the attachment hole which consists of round holes other than a square hole, and to form a recessed part formation member so that it may fit.

  The recessed portion forming member 37 is formed of a bottomed box-shaped member having an open front surface, and a flange portion 37a is formed on the front end portion of the recessed portion forming member 37 so as to overlap the rim of the mounting hole 33a from the front side. . The recess forming member 37 is preferably attached to the abdomen 33 via a bolt or screw fixing tool (not shown) in the collar portion 37a, but these fixing tools may be omitted. The bottom plate portion 37b of the recess forming member 37 is provided in an inclined shape so as to be substantially orthogonal to the reinforcing bar insertion member 34, and a front insertion hole 37c through which the reinforcing bar insertion member 34 is inserted is formed at a substantially central portion of the bottom plate portion 37b. Yes. The recess forming member 37 is configured in the same manner as the recess forming member 15 of the first embodiment configured to be horizontally long.

  The front end of the reinforcing bar insertion member 34 is disposed in the recess 35 of the recess forming member 37 through the rear insertion hole 33b and the front insertion hole 37c, and the bottom plate portion of the recess forming member 37 is inserted through the presser plate 38. The nut member 39 is fastened to the threaded shaft 34a of the reinforcing bar insertion member 34 in a state of being superposed on the reinforcing member 37b, thereby being fixed to the vertical pile 31 via the presser plate 38 and the recess forming member 37.

  For example, when constructing an underground space using the earth retaining structure 30, first, the vertical holes 5 are drilled at a set interval with respect to the ground 1, and the vertical piles 31 are inserted into the vertical holes 5. Then, mortar is poured into the lower part of the vertical hole 5 and the lower part of the vertical pile 31 is fixed to the ground 1 with mortar. Next, the ground 1 is excavated stepwise along the vertical pile 31 to a desired depth to form an excavation hole whose plane dimension is slightly wider than the underground space. When excavating the excavation hole, After the excavation is completed at each stage, the following work is performed to prevent the wall portion 2 from collapsing. That is, the retaining plate 32 is constructed between the vertical pile 31 and the wall portion 2, and the upright 33 is erected on the bracket 36 of the vertical pile 31 over the adjacent vertical pile 31, and the rear portion of the upset 33 is provided. A hole 3 is formed in the wall 2 at a position corresponding to the insertion hole 33b, extending sideways obliquely downward with respect to the horizontal direction. Next, the grout 4 is filled with the grout 4 and then the reinforcing bar insertion material 13 is loaded, and the grout 4 is cured and solidified. Next, the recess forming member 37 is erected and attached to the mounting hole 33a of the 33 so that the end of the reinforcing bar insertion member 34 is inserted into the front insertion hole 37c of the recess forming member 37, and then the presser plate 38 is attached. It attaches to the front end part of the reinforcing bar insertion member 34, fastens the nut member 39 to the screw shaft 34a, and connects the abdomen 33 to the reinforcing bar insertion member 34. In this way, after sequentially installing the reinforcing bar insertion material 34 at a position corresponding to the rear insertion hole 33b, the reinforcing bar insertion material 34 is erected and fixed to 33 in order, and the excavation hole is excavated to the next stage, The earth retaining structure 30 is constructed by sequentially performing the drilling of the excavation hole, the construction of the reinforcing bar insertion member 34, and the fixing operation of the reinforcing bar insertion member 34 to the uplift 33.

  Since the anchoring pedestal 30 is not required in the earth retaining structure 30, the material cost of the earth retaining structure 30 can be reduced, and the fixing pedestal can surely make the underground space narrow and the anchoring pedestal can be an obstacle to work. Can be prevented.

  In the earth retaining structure 30 as well, as in the other embodiments of the first embodiment, the spherical surface projection that protrudes toward the wall portion 2 side so as to surround the front insertion hole 37c in the bottom plate portion 37b of the recess forming member 37 is provided. The holding member 21 which forms the seat 20 and has a partial spherical surface which fits the spherical receiving surface 20 between the holding plate 38 and the spherical receiving surface 20 and through which the reinforcing bar insertion member 34 is inserted can be provided. Moreover, it is also possible to provide the vertical pile 31 and the flank 33 with the concave portions 35 respectively, and to fix the vertical pile 31 and the flank 33 to the reinforcing bar insertion material 34.

DESCRIPTION OF SYMBOLS 1 Ground 2 Wall part 3 Drilling hole 4 Grout 5 Vertical hole 10 Retaining structure 11 Vertical pile 11a Mounting hole 11b Rear insertion hole 12 Retaining plate 13 Reinforcing bar insertion material 13a Screw shaft 14 Recess 15 Recess formation member 15a Saddle 15b Bottom plate 15c Front Part insertion hole 16 Presser plate 17 Nut member 20 Spherical seat 21 Presser member 22 Connecting member 11B Vertical pile 11Ba Vertical pile divided body 30 Earth retaining structure 31 Vertical pile 32 Earth retaining plate 33 Raising 33a Mounting hole 33b Rear insertion hole 34 Reinforcing bar insertion Material 34a Screw shaft 35 Concave part 36 Bracket 37 Concave forming member 37a Gutter part 37b Bottom plate part 37c Front insertion hole 38 Presser plate 39 Nut member

Claims (6)

A vertical pile provided along the wall portion of the ground, a retaining plate provided across adjacent vertical piles, and a reinforcing bar insertion material embedded in the ground by projecting an end portion outward from the wall portion, In the earth retaining structure configured to receive the earth pressure acting on the earth retaining plate with the reinforcing bar insertion material through the vertical pile,
A concave portion is formed in the vertical pile, and an end of the reinforcing bar insertion material is fixed to the vertical pile in the concave portion,
Doji structure characterized by that.   An upright erection is provided in the middle of the vertical direction of the vertical pile, a recess is formed in the upright instead of the vertical pile, and the end of the reinforcing bar insertion material is erected in the recess. The earth retaining structure according to claim 1, which is fixed to a shim.   A vertical erection is provided in the middle of the vertical pile in the height direction, a recess is also formed in the erection, and the end of the reinforcing bar insertion member is a vertical pile or erection in the recess. The earth retaining structure according to claim 1, which is fixed to the wall.   A mounting hole is formed corresponding to the concave portion in the vertical pile and / or the flank forming the concave portion, and the concave portion is formed by fitting and fixing a bottomed concave portion forming member made of another member to the mounting hole. The earth retaining structure according to any one of claims 1 to 3.   The earth retaining structure according to any one of claims 1 to 4, wherein a spherical seat that receives an end of the reinforcing bar insertion member so as to be adjustable in angle is formed in the recess. The earth retaining structure according to any one of claims 1 to 5, wherein the vertical piles and / or erections forming the recesses are made of steel pipes.

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